org.eclipse.jgit.errors.TransportException: Nothing to fetch. in case of no fetch configuration

[konr...@gmx.de]

I get the following error when I try to execute maven-jgitflow-plugin on Jenkins with the following command:

mvn -DenableSshAgent=true -DreleaseVersion=0.5 -DautoVersionSubmodules=true -DpushReleases=true jgitflow:release-start -X

The error message is:

org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.atlassian.maven.plugins:maven-jgitflow-plugin:1.0-alpha26:release-start (default-cli) on project netcentric-parent: Error starting release: error configuring remote git repo with url: null
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:622)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error starting release: error configuring remote git repo with url: null
	at com.atlassian.maven.plugins.jgitflow.ReleaseStartMojo.execute(ReleaseStartMojo.java:81)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	... 19 more
Caused by: com.atlassian.maven.plugins.jgitflow.exception.JGitFlowReleaseException: error configuring remote git repo with url: null
	at com.atlassian.maven.plugins.jgitflow.helper.DefaultProjectHelper.ensureOrigin(DefaultProjectHelper.java:573)
	at com.atlassian.maven.plugins.jgitflow.manager.DefaultFlowReleaseManager.startRelease(DefaultFlowReleaseManager.java:140)
	at com.atlassian.maven.plugins.jgitflow.manager.DefaultFlowReleaseManager.start(DefaultFlowReleaseManager.java:46)
	at com.atlassian.maven.plugins.jgitflow.ReleaseStartMojo.execute(ReleaseStartMojo.java:77)
	... 21 more
Caused by: org.eclipse.jgit.api.errors.TransportException: Nothing to fetch.
	at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:137)
	at com.atlassian.maven.plugins.jgitflow.helper.DefaultProjectHelper.ensureOrigin(DefaultProjectHelper.java:569)
	... 24 more
Caused by: org.eclipse.jgit.errors.TransportException: Nothing to fetch.
	at org.eclipse.jgit.transport.Transport.fetch(Transport.java:1081)
	at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:128)
	... 25 more

The .git/config looks like
[core]
        repositoryformatversion = 0
        filemode = true
        logallrefupdates = true
[remote "origin"]
        url = ssh://git@<URL removed for privacy reasons.>
[branch "master"]
        remote = origin
        merge = refs/heads/master
[gitflow "branch"]
        master = master
        develop = develop
[branch "develop"]
        remote = origin
        merge = refs/heads/develop
[gitflow "prefix"]
        feature = feature/
        release = release/
        hotfix = hotfix/
        support = support/
        versiontag =

To me it seems this error is triggered, because the fetch line is missing from the config in the remote section. This is not added by the Git plugin of Jenkins by default, because usually nothing is fetched there. The maven-jgitflow-plugin should be able to deal with such a case.

[konr...@gmx.de]

I opened bug https://ecosystem.atlassian.net/browse/MJF-117 for that.

[Jonathan Doklovic]

Thanks for logging the issue. the jgitflow plugin only messes with th eorigin entry in the config if it doesn't exist. Since th eorigin url is set by Jenkins, the plugin assumes everything is ok. Looks like we just need to check if the fetch is setup as well and if not add it in.